Throat-plate for buttonhole sewing and cutting machines.



1). NOBLE & J. s. FINGH. THROAT PLATE FOR BUTTONHOLB SEWING AND GUTTING MACHINES.

APPLIOATION FILED DEO.19,1906.

Y Patented May 11, 1909.

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DONALD NOBLE AND JOHN FINCH, OF BRIDGEPORT, CONNECTICUT, ASSIGNORS, BY MESNE ASSIGNMENTS, TO THE SINGER MANUFACTURING COMPANY, A, CORPORATION OF NEW JERSEY. V

THROAT-PLATE non BUTTONHOLE snwme AND CUTTING MACHINES.

Specification of Letters Patent.

Patented May 11, 1909,

Application filed December 19, 1906. Serial No. 348,621.

To all whom it may concern:

Be it known that we, DONALD NOBLE, a subject of the King of Great Britain, and JOHN S. FINoH, a citizen of the United States, residents of Bridgeport, in the county of Fairfield and State of Connecticut, have invented certain'new and useful Improvements in Throat-Plates for Buttonhole Sewing and Cutting Machines, of which the following is a specification.

This invention relates to improvements in throat-plates for buttonhole sewing and cutting machines, and has for its object to provide improved means for preventing the out edges of the material from being carried into the blade slot by the action of the cutterblade.

It has been common in connection'with the earlier forms or" construction to employ an adjustabljf-secured ledger-plate in connection. with a pivotally-secured and resiliently-held cutter-blade guard-plate. I

In our present invention we employ two slidabl -mountod and resiliently-held guardplates arranged on opposite sides of the vertical line of cutter-blade actuation, and normally held in like adjustment relatively to said line of actuation.

Referring to the drawings, in the several figures of which like parts are similarly designated, Figure 1 is a plan view of a buttonhole sewing machine cloth-plate equipped with our improved throat-plate. Fig. 2 is an underside view 01 Fig. 1. Fig. 3 is a section on the line AA, Fig. 1. Fig. 4 is an enlarged sectional view on the line a c, Fig. 1. Fig. 5 is an enlarged detail view, in perspective, of the cutter-blade guard-plate located at the left of the blade-slot, Fig. 1. Fig. 6 is an enlarged detail view, in perspective, of the knife-guard guide-plate. Fig. 7 is a view, in perspective, of the buttonhole cutter-blade. Fig. 8 is'a view in perspective of the form of spring employed for resiliently holding the cutter-blade guardplates in their normal positions.

1 is the cloth-plate secured to the buttonhole sewing machine base (not shown) in any suitable manner, as by screws (not shown) passing through holes 2, 2 and threaded into said base.

3 and 4 are the cutter-blade guard-plates mounted in a suitable seat 5 formed in the cloth-plate. The opposite ends of the guard- .plates are provided with flanges 6, 6, which underhe flanges 7 formed on oppositelyarranged guide-plates 8, 8, which latter are secured screws 9 to the cloth-plate 1.

10, 10 are springs secured by screws 11, 11 to the underside of the cloth-plate and provided with upturned ends 12, 12 which enter suitable holes 13, 13 formed in the guardplates 3 and 4.

14, 14 are pins, secured in the cloth-plate 1, against which the rounded inner opposite corners 15 of the guard-plates register when said plates are held in their normal positions by the action of the springs 10, 10.

In the cloth-plate 1 is formed a slot 16 arranged parallel with the two inner edges of the guard lates and provided at one end with a need e opening 17 which registers with needle slots 18, 18 formed in the plates 3 and 4.

19 isthe cutter-blade of usual construction which may be mounted so as to descend into the slot 20 by the employment of wellunderstood means (not shown), which means forms no part of our present invention.

From the foregoing it will be understood that when the cutter-blade 19 is caused to descend into the slot 20, the beveled portions 21, 21 of said blade act upon the guardplates 3 and 4 to move'them bodily in directions away from each other, thus preventing the cut edges of the material from being carried into the blade-slot; also, that the registering pins 14, 14 efiiect an opening between the inner edges of the two guard-plates of sufficient width to permit the thin cutting edge of the blade 19 to enter.

What we claim is 1. In a buttonhole cutting mechanism for buttonhole sewing machines, a cutter-blade and a cloth-plate, the former normally located entirely above said cloth-plate, the latter being provided with oppositely arranged spring-held guard-plates capable of being moved bodily in opposite directions, in combination with means forming a part of said cloth-plate for limiting the movements of said guard-plates in directions toward each other.

2. In a buttonhole cutting mechanism for buttonhole sewing machines, a cutter-blade, a cloth-plate provided with guard-plates, the opposite ends of which latter underlie suita e guide-plates, in combination with oppositely arranged springs which act upon the with suitable pins for registering said guard- 15 opposlte ends of said guard-plates to cause plates 111 then normal positlons, 111 combinathe latter to resiliently resist the action of the l cutter-blade.

3. In a buttonhole cutting mechanism for 1 buttonhole sewing machines, a cutter-blade, a cloth-plate provided with oppositely arranged guardplates, said cloth-plate being provided with a slot for the passage of the cutter-blade, an opening for the passage of the needle, and a seat for said guard-plates, said guard-plates being provided with needle slots and having arranged in their inner opposite corners circular portions which coact tion with. means for resiliently holding said guard-plates 1n opposition to the downwanl thrust of the cutter-blade.

Signed at Bridgeport, in the county of 20 Fairfield, and State of Connecticut, this 18th day of December, A. D. 1906.

DONALD NOBLE. JOHN FINOH.

Witnesses A. K. WILLIAMs, J12, W. G. MARKS. 

